Nitto-denko Corporation

Mitsubishi Chemical Corporation

Dai Nippon Printing Co., Ltd.

Keio University

Nitto Jushi Kogyo Co., Ltd.

Nitto Denko Corportation

Nitto Denko Cororation

Nao Murakami

Hiroyuki Yoshimi

Takashi Shimizu

Kentarou Takeda

Takashi Yamaoka

Yuuichi Nishikouji

Kazuki Uwada

Toshiyuki Iida

Masaki Hayashi

Hiroyuki Takemoto

Kozo Nakamura

Shingo Namiki

Tomohiko Tanaka

Shinichi Sasaki

Hironori Yaginuma

Tadashi Kojima

Takeharu Kitagawa

Takehito Fuchida

Shouhei Maezawa

Hiroshi Sumimura

Hiroyuki Hayashi

Shuuji Yano

Seiji Kondo

Satoshi Hirata

Daisuke Hattori

Junichi Nagase

Hiromoto Haruta

Masayuki Kawai

Hisatoshi Uehara

Kentarou Yoshida

Yuuichi Hirami

Motoko Kawasaki

Junichi Adachi

Kanako Wasai

Hiroshi Yamamoto

Tsuyoshi Ishikawa

Yasuhiro Koike

Hideki Ishida

Fumihiro Arakawa

Daisuke Hayashi

Masashi Yokogi

Michiaki Fuji

Eizaburo Higuchi

Runa Nakamura

Masatsugu Higashi

Yoshiyuki Kiya

Naotaka Kinjo

Takaaki Ishii

Tatsuki Nagatsuka

Shinobu Nagano

Tokio Fujita

Kanto Kobayashi

Narifumi Ueda

Takeshi Nishibe

Takashi Kumano

A film is provided with void spaces having a porous structure with less cracks and a high proportion of void space as well as having strength. The film with void spaces includes one kind or two or more kinds of structural units that form a structure with minute void spaces, wherein the structural units are chemically bonded through catalysis. For example, the abrasion resistance measured with BEMCOT&#xae; is in the range from 60% to 100%, and the folding endurance measured by the MIT test is 100 times or more. The film with void spaces can be produced by forming the precursor of the silicone porous body using sol containing pulverized products of a gelled silicon compound and then chemically bonding the pulverized products contained in the precursor of the silicone porous body. The chemical bond among the pulverized products is preferably a chemical crosslinking bond among the pulverized products.

Film with void spaces bonded through catalysis and method of producing the same

The present invention provides, for example, a silicone porous body having a porous structure with less cracks and a high proportion of void space as well as having a strength. The silicone porous body of the present invention includes silicon compound microporous particles, wherein the silicon compound microporous particles are chemically bonded by catalysis. For example, the abrasion resistance measured with BEMCOT&#xae; is in the range from 60% to 100%, and the folding endurance measured by the MIT test is 100 times or more. The silicone porous body can be produced, for example, by forming the precursor of the silicone porous body using sol containing pulverized products of a gelled silicon compound and then chemically bonding the pulverized products contained in the precursor of the silicone porous body. The chemical bond among the pulverized products is preferably a chemical crosslinking bond among the pulverized products, for example.

Silicone porous body and method of producing the same

An object of the present invention is to provide a retardation film excellent in various properties such as optical properties, heat resistance, mechanical properties, and reliability. The present invention relates to a retardation film containing a thermoplastic resin and composed of a single layer, in which the retardation film has a value of wavelength dispersion that is a ratio of retardations at a wavelength of 450 nm and at a wavelength of 550 nm being 0.75 or more and 0.92 or less; a birefringence at a wavelength of 550 nm and the wavelength dispersion satisfy a relationship of &#x394;n&#x2265;0.0140&#xd7;(R450/R550)&#x2212;0.0082; and a photoelastic coefficient is 25&#xd7;10Paor less.

Retardation film, circularly-polarizing plate, and image-displaying device

The retardation film of the present invention contains a resin having positive refractive index anisotropy and containing at least one bonding group of a carbonate bond and an ester bond and one or more structural units selected from the group consisting of a structural unit represented by the general formula (1) and a structural unit represented by the general formula (2), in which the value of wavelength dispersion (R450/R550) as a ratio of retardation R450 at a wavelength of 450 nm to retardation R550 at a wavelength of 550 nm is more than 0.5 and less than 1.0: (in formula (1) and formula (2), definitions of Rto Rare the same as in the description).

The retardation film of the present invention contains a thermoplastic resin and is constituted of a single layer. A value of wavelength dispersion (R450/R550) that is a ratio of a retardation R450 at a wavelength of 450 nm and a retardation R550 at a wavelength of 550 nm is 0.70 or more and 0.85 or less; and a photoelastic coefficient is 14&#xd7;10Paor less.

There is provided a circularly polarizing plate for an organic EL display apparatus that is excellent in productivity, is prevented from warping, and can achieve an excellent tint. An elongated circularly polarizing plate for an organic EL display apparatus according to an embodiment of the present invention includes in the following order: an elongated polarizer having an absorption axis in a longitudinal direction thereof; an elongated first retardation layer functioning as a &#x3bb;/2 plate; and an elongated second retardation layer functioning as a &#x3bb;/4 plate. An angle formed between the absorption axis of the elongated polarizer and a slow axis of the elongated first retardation layer is front 15&#xb0; to 30&#xb0;; and the absorption axis of the elongated polarizer and a slow axis of the elongated second retardation layer are substantially perpendicular to each other.

Circular polarizer for organic EL display device having laminated half wavelength plate and quarter wavelength plate, and organic EL display device

Disclosed herein is a process for producing a transparent film, including the step of stretching a film in at least one direction under a condition(s) that satisfies an expression (5):200%/min&#x2264;[stretching speed(strain rate)]&#x2264;1,200%/min&#x2003;&#x2003;(5),wherein the film comprises a polycarbonate resin containing at least a constitutional unit derived from a dihydroxy compound (A) that has a bonded structure represented by a structural formula (1): in which no hydrogen atom is bonded to the oxygen atom contained in the structural formula (1).

Polycarbonate resin film, and transparent film and process for producing the same

There is provided an optical member that can realize a liquid crystal display apparatus that is excellent in mechanical strength and has high illuminance. An optical member according to an embodiment of the present invention includes a polarizing plate, a reflective polarizer, and a prism sheet in the stated order. The optical member has a reflectance of 70% or more for linearly polarized light having a wavelength of 650 nm entering the reflective polarizer at 45&#xb0;.

Optical member, polarizing plate set, and liquid crystal display apparatus

There is provided a circularly polarizing plate capable of realizing a bendable display apparatus in which an excellent reflection hue is obtained and a color change due to bending is suppressed. A circularly polarizing plate according to the present invention is used in a bendable display apparatus. The circularly polarizing plate includes: a polarizer; and a retardation film arranged on one side of the polarizer. In-plane retardations of the retardation film satisfy a relationship of Re(450)&#x3c;Re(550)&#x3c;Re(650), and a slow axis direction of the retardation film is adjusted so as to form an angle of from 20&#xb0; to 70&#xb0; with respect to a bending direction of the display apparatus.

Circular polarizing plate and bendable display device

There is provided an optical member that suppresses the occurrence of moire, and can realize a liquid crystal display apparatus that is excellent in mechanical strength and has high brightness. An optical member according to an embodiment of the present invention includes a polarizing plate, a light diffusion layer, a reflective polarizer, and a prism sheet in the stated order.

Optical member, polarizing plate set and liquid crystal display apparatus

Provided is a method capable of producing a retardation film suppressed in biaxiality, having a small Nz coefficient, and having a slow axis in an oblique direction with high production efficiency. The production method for a retardation film of the present invention includes: holding left and right side edge portions of a film to be stretched with left and right variable pitch-type clips configured to have clip pitches changing in a longitudinal direction, respectively; preheating the film; reducing, under a state in which a position at which the clip pitch of the clips on one side out of the left and right clips starts to reduce and a position at which the clip pitch of the clips on another side starts to reduce are set to different positions in the longitudinal direction, the clip pitch of each of the clips to a predetermined pitch to subject the film to oblique stretching; and releasing the clips holding the film.

Production method for phase shift film and circular polarizing plate involving bilaterally symmetric loops with non-simultaneous reduction of clip pitch

Provided is a method capable of producing a retardation film being excellent in axial accuracy, showing small changes in retardation and dimensions at the time of its heating, and having a slow axis in an oblique direction with high production efficiency. The production method for a retardation film of the present invention includes: holding left and right end portions of a film with left and right variable pitch-type clips configured to have clip pitches changing in a longitudinal direction, respectively; preheating the film; causing the clip pitches of the left and right clips to each independently change to obliquely stretch the film; reducing the clip pitches of the left and right clips to shrink the film in the longitudinal direction; and releasing the film from being held with the clips.

Methods for producing phase-difference film and circularly polarizing plate involving simultaneous reduction of clip pitch on one side and increase of clip pitch on another side

The present invention provides a method capable of producing a retardation film having an elongated shape, having high uniaxiality and a high in-plane alignment property, and having a slow axis in an oblique direction with high production efficiency. The production method for a retardation film of the present invention includes: holding left and right end portions of a film with left and right variable pitch-type clips configured to have clip pitches changing in a longitudinal direction, respectively; preheating the film; increasing the clip pitch of the clips on one side and reducing the clip pitch of the clips on another side, while extending a distance between the left and right clips, to obliquely stretch the film; maintaining or reducing the clip pitch of the clips on the one side and increasing the clip pitch of the clips on the another side so that the clip pitches of the left and right clips are equal to each other, while extending the distance between the left and right clips, to obliquely stretch the film; and releasing the film from being held with the clips.

A polycarbonate resin film of the present invention is formed from a polycarbonate resin which contains at least a constitutional unit derived from a dihydroxy compound having a bonded structure represented by the following structural formula (1) and satisfies the following expression (2) when subjected to a tensile test at a standard stretching temperature for the polycarbonate resin and at a pulling speed (strain rate) of 1,000%/min.[Chem. 1]CH&#x2014;O&#x2003;&#x2003;(1)(No hydrogen atom is bonded to the oxygen atom contained in the structural formula (1).)0.9&#x2266;[(lower yield stress in tension)/(upper yield stress in tension)]&#x2266;1&#x2003;&#x2003;(2).

Growing community of inventors

Ibaraki, Japan

Nao Murakami